Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '590a1bf177f0fd513d215b950c0daef6dac8b66c6e94b8e7a6b05476879e679c' 
  AND token = 'FBVVEmiP8V9iNRfxatdhws8ckHfNfvVKYH6Nvy3Rgow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}